. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. The animals of Conochilus volvox, half contracted, forming a circle. (After Ehrenberg.} Family 3.—MEGALOTROCHCEA. Character. Monotrochous rotatory animals, with the mar- gin of the rotatory organ incised or flexuous, not inclosed in a shield. The flexuous extended rotatory organ is used for locomotion, swimming, and the sup- ply of nutriment. Muscular bands are evident in the interior, by which the form of the body is changed. In Megalotrocha, the alimen- tary canal is supplied with a stomach, two caeca, jaws with a doub
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. The animals of Conochilus volvox, half contracted, forming a circle. (After Ehrenberg.} Family 3.—MEGALOTROCHCEA. Character. Monotrochous rotatory animals, with the mar- gin of the rotatory organ incised or flexuous, not inclosed in a shield. The flexuous extended rotatory organ is used for locomotion, swimming, and the sup- ply of nutriment. Muscular bands are evident in the interior, by which the form of the body is changed. In Megalotrocha, the alimen- tary canal is supplied with a stomach, two caeca, jaws with a double row of teeth, and two pancreatic glands. In the other two species there is a single canal, without sto- mach or caeca. Microcodon has jaws with two teeth. Cyphonautes is toothless. The re- productive organs consist of an ovarium. The ova in Megalotrocha are attached to the parent by a thread. Vessels, and tre- mulous gill-like organs, are observed in Megalotrocha. The organs of the senses are in two genera — the red eyes. Mega- lotrocha exhibits radiated nervous masses, and above these four dark glandular bodies in the neighbourhood of the mouth. These have been erroneously regarded as eyes (Jig- 291.). Analysis of genera. Eyeless. Cyphonautes. •nr-,, /One eye. Microcodon. [Two eyes. Megalotrocha. Of these three genera, Megalotrocha is the only one that is well known, or that appears to answer to the description of the family. Cyphonautes is a marine animal, of which Eh- renberg has seen but two specimens. Micro- codon has also doubtful characters. Megalo- trocha, of which there is only one species, M. albo-flavicans, has often been described by the older observers. Fig. Megalotrocha fiavicans. (After Ehrenberg.) a, a, nervous ganglia; b, jaws; c, ovum ; d, d, bodies whose functions are unknown; e, e, e, e, trans- verse vessels. Family 4. — FLOSCULARIA. Character. Monotrochous loricated Rotifers, with a ro- tatory organ, with sinuous lobed or multifid margins.
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